Senior Network Engineer

Job Description GTSC and its Global Sciences and Technology (GST) business unit seeks an experienced Senior Network Engineer to design, implement, secure, and support enterprise network infrastructure. This role requires deep technical expertise, strong troubleshooting skills, and the ability to lead network initiatives from planning through execution. The ideal candidate will have hands‑on experience with SonicWall firewalls and Cisco switches in complex, production environments. The position is approved for a hybrid work schedule but requires onsite presence at our Fairmont, WV office. Primary Duties Design, implement, and maintain reliable, secure, and scalable network infrastructure Configure, manage and troubleshoot SonicWall firewalls, including VPNs, security policies and threat management Install, configure and support Cisco switches, including VLANs, routing, QoS and switch stacking Monitor network performance, availability and security, proactively addressing issues Lead network upgrades, migrations and infrastructure improvement projects Troubleshoot complex network issues across LAN, WAN, WLAN and VPN environments Collaborate with systems, security and application teams to ensure network alignment with business needs Create and maintain network documentation, diagrams and standard operating procedures Mentor junior engineers and provide technical leadership Ensure compliance with security standards and best practices Participate in on‑call rotation and provide after‑hours support as needed Required Education, Experience & Skills Bachelor's degree in computer science or related field of study 7 or more years of hands‑on network engineering experience in enterprise environments Proven experience with SonicWall firewalls (configuration, management and troubleshooting) Strong experience with Cisco switches (Catalyst, Nexus or similar) In‑depth knowledge of TCP/IP, DNS, DHCP, VLANs, routing protocols (OSPF, BGP preferred) and VPN technologies Experience with network monitoring and diagnostic tools Strong analytical, problem‑solving and communication skills Applicants selected will be subject to a government background investigation and may need to meet eligibility requirements. Benefits We celebrate your contributions and provide opportunities and choices along with support for your total well‑being. Our offerings include health, life, disability, financial and retirement benefits, paid leave, professional development, tuition assistance, work‑life programs and dependent care for full‑time employees working 30-plus hours per week. Our recognition awards program acknowledges employees for exceptional performance. GTSC is an Equal Opportunity Employer and does not discriminate on the basis of race or ethnicity, religion, sex, national origin, age, veteran status, disability or genetic information or any other reason prohibited by law. GTSC is committed to providing reasonable accommodation to applicants with physical and mental disabilities. GTSC participates in the E‑Verify program in all locations as required by law. #J-18808-Ljbffr